Charles taylor and george benjamin taylor



6N0 Model.)

0. & G. B. TAYLOR.

DRILL CHUCK.

No. 407.554. Patented July 23, 1889,.

" NITED STATES PATENT OFFICE.

CHARLES TAYLOR AND GEORGE BENJAMIN TAYLOR, OF BIRMINGHAM,

V ENGLAND. 4

DRILL-CHUCK.

SPECIFICATION forming part of Letters Patent No. 407,554, dated July 23,1889.

Application filed November 20, 1888. Serial No. 291,411. (No model.)Patented in England October 18, 1887, No. 14,146; in France July 24,1888, No. 191,994, and in Belgium July 25, 1888,1To.82,685.

To all whom it may concern.-

Be it known that we, CHARLES TAYLOR and GEORGE BENJAMIN TAYLOR, both ofBirmingham, England, subjects of theQueen of Great Britain, haveinvented certain new and useful Improvements in Chucks for Lathes, partsof which improvements are also applicable to Vises and to cramps, (forwhich we have received Letters Patent in Great Britain, No. 14,146,dated October 18, 1887; in France, No. 191,994, dated July 24, 1888, andin Belgium, No. 82,685, dated July 25, 1888,) of which the following isa specification.

Our invention relates to lathe-chucks, and has for its object to providean improved construction in that class of chucks having the ways inwhich the jaws move inclined to the axis of the chuck, and having theactuating device for the jaws placed upon the outside of said jaws, andthis we accomplish in the manner and by the means hereinafter describedand claimed, reference being had to the accompanying drawings, in which-Figure 1 represents a chuck embodying our improved construction, partlyin elevation and partly in section, showing the jaws partly projecting.Fig. 2 represents a front elevation of the chuck-body having theactuating device for the jaws removed, the said jaws being shown inposition; and Fig. 3 represents a section of a portion of the body,taken through the line A B, Fig. 1, showing one of the jaws in position.

Referring to the said drawings, the letter L indicates the cylindricalbody of the chuck, which is of a truncated conical form at the front andhas an axial hole of a size suitable for the largest diameter of workintended to be held by it. The rear of the said axial hole is enlargedand made conical for attachment to the machine it is. intended for. Thesaid body L has three radial slots cut in its conical front, the bottomsof said slots being parallel with the conical face of the body. In thesaid slots or ways the jaws M work, and are actuated by a hollowexternal cone or shell N, having spiral screw-threads cut on its innerface and engaging with correspondingly-shaped teeth on the faces of thesaid jaws. The rear of the hollow cone or shell N is made cylindricalandfits upon the cylindrical part of the body L, and is held in position bythe ring 0, threaded upon its rear end and abutting against a shoulderformed upon the body L of the chuck, as in Fig. 1. The ring 0 and shellN are milled on their circumferences for convenience in turning them;but, if desired, they may be turned by levers or other means.

Referring to Fig. 1, it will be noticed that the spiral screw-threads onthe shell N, and also the corresponding teeth on the jaws M, are atright angles to the line of pressure or parallel to the axis of thechuck. By making the faces of these threads and teeth as above describedthey are not liable to be stripped under great pressure, as the face bywhich the pressure is borne is at right angles to the direction. ofpressure, and is firmly backed up or supported.

Having thus described our invention, what we claim, and desire to secureby Letters Patcut, is

In a lathe chuck, the combination of a chuck-body having its conicalface provided with radial slots parallel with said face and at an angleto the axis of the chuck, sliding jaws adapted to move in said ways andprovided with toothed faces projecting above the conical face of thechuck-body, an inclosingshell surrounding the chuck-body and havin aconical portion provided with internal screwthreads that engage theteeth of the sliding jaws, and a ring having a screw-threaded engagementwith the-rear end of said shell and CHARLES TAYLOR. [L s] GEORGEBENJAMIN TAYLOR. LL. s]

Witnesses:

RICHARD SKERRETT, ARTHUR J. POWELL.

